if loop error in MALAB

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ali hassan
ali hassan on 2 Feb 2022
Commented: Steven Lord on 2 Feb 2022
i am using the following if loop but it is not executing:
n=[]
if n==[]
sprintf('a')
end
it dose not print 'a'
  2 Comments
Steven Lord
Steven Lord on 2 Feb 2022
From the documentation page: "if expression, statements, end evaluates an expression, and executes a group of statements when the expression is true. An expression is true when its result is nonempty and contains only nonzero elements (logical or real numeric). Otherwise, the expression is false."
Is your expression nonempty and does it contain only nonzero elements?
n = [];
n == []
ans = 0×0 empty logical array
Your expression is empty so the statements inside the if block are not executed.
If you look at the suggestion from James Tursa:
isempty(n)
ans = logical
1
This is nonempty and it contains only nonzero elements. Therefore the if statement's expression is true and so the statements inside the if block are executed.

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Accepted Answer

James Tursa
James Tursa on 2 Feb 2022
Change your test to
if isempty(n)

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